Possible solution for OWN custom stories not showing up under the Custom Stories menu

[Your Computer]

The article you link to doesn't forget to mention that the files should have a specific file extension. You must be new to Windows.

BTW, in Windows 7 you can access the folder options with Alt + T and then Alt + O in the file manager. It's really a security issue that Microsoft has allowed to exist for a long while. Not knowing a file's proper file extension can be dangerous.